Explicitely use tuples for except:
-rw-r--r-- 18 .gitignore
-rw-r--r-- 672 PURPOSE
-rw-r--r-- 2190 README
drwxr-xr-x - master
drwxr-xr-x - overlay
drwxr-xr-x - scripts
drwxr-xr-x - slave